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Effects of first insemination age and weight on milk and reproductive traits in black and white cows

机译:第一次授精的年龄和体重对黑白奶牛泌乳和生殖特性的影响

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摘要

In cattle breeding 90% of the income earned is obtained from reproduction and yields related to reproduction, but completion of physiological growing is necessary for this. As physiological growing is completed only after a long period, animals lead much of their lives as nonproductive. Shortening this non-productive period is very important in economic terms, therefore. That is why cattle have to be first inseminated at a certain age, which varies according to breed, and when they reach 75% of mature liveweight.
机译:在牛育种中,所赚取的收入的90%来自繁殖和与繁殖有关的产量,但为此必须完成生理生长。由于生理生长只有很长一段时间才能完成,因此动物大部分时间都处于非生产状态。因此,从经济角度来讲,缩短非生产期非常重要。这就是为什么必须在一定的年龄首先对牛进行授精的原因,该年龄因品种而异,并且要达到成熟体重的75%。

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